python examples added

python/translator.py

@@ -0,0 +1,68 @@
+# translator for arbitrary pgf grammar and language pair, given as arguments
+
+import pgf
+import sys
+
+def trim(s0):
+    "lower-case first word and tokenize" 
+    s = s0.strip()
+    if not(s):
+        return s
+    s = (s[0].lower() + s[1:])
+    r = ""
+    for c in s:
+        if c in [',','.',':','(',')']:
+            r = r + ' ' + c + ' '
+        else:
+            r = r + c
+    return r
+
+def missing(eng,s):
+  "words in a sentence not found in morphological analysis"
+  ws = s.split()
+  ms = []
+  for w in ws:
+    if not eng.lookupMorpho(w):  # strange behaviour of eng
+      ms = ms + [w]
+  return ms
+
+def main():
+  "translation loop, reads stdio line by line"
+  if len(sys.argv) < 4:
+    print("  usage: python3 translator.py <pgf-file-prefix> <from-lang-suffix> <to-lang-suffix> -debug?")
+    print("  e.g. python3 translator.py CSETranslator Eng Swe")
+    print("  The program reads and writes stdio line by line, e.g")
+    print("    cat ../course_plans/TIN214Eng.txt | python3 translator.py CSEShallow Eng Swe")
+    return
+  pgfm = sys.argv[1]
+  pgff = pgfm + ".pgf"
+  ceng = pgfm + sys.argv[2]
+  cswe = pgfm + sys.argv[3]
+  debug = len(sys.argv) == 5 and sys.argv[4] == "-debug"
+  gr = pgf.readPGF(pgff)
+  eng = gr.languages[ceng]
+  swe = gr.languages[cswe]
+  print("#","translating with",pgff,"from",ceng,"to",cswe)
+  while True:
+    try:
+        line = input("")
+    except EOFError:
+        break
+    t = trim(line)
+    if not(t):
+          pass
+    else:
+          try:
+              px = eng.parse(t)
+              p,e = px.__next__()
+              if debug:
+                  print("# TREE", e)
+              print(swe.linearize(e))
+          except pgf.ParseError:
+              print("# NO PARSE", t)
+              if debug:
+                  print("# MISSING", missing(eng,t))
+
+main()
+
+